I have a Systemax. It's actually manfactured about 10 miles away from my house. I of course didn't know this until later (when we had already paid $100 to have it shipped to us ).
I don't think I'd really recommend it.
Recently we just had a new motherboard and a new processor installed. So in 3 years I've spent about $300. I personally think it's a ripoff since we spent about $1500 for the machine to start with